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Contest: the 9 Queens Problem. Put 9 queens and 1 or 2 pawns such that queens do not see each other. Send your solution before Feb 29, and win a book![All Comments] [Add Comment or Rating]
David Paulowich wrote on Tue, Apr 24, 2007 10:05 PM UTC:Good ★★★★
The following diagram shows 9 queens on a 9x9 board:

 . . . . . . . . x
 . . . . x . . . .
 . . . . . . . x .
 . . . x . . . . .
 x . . . . . . . .
 . . . . . . x . .
 . x . . . . . . .
 . . . . . x . . .
 . . x . . . . . .